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Un agujero negro de alta velocidad en una órbita de halo galáctico en el vecindario solar
I F Mirabel1, V Dhawan, R P Mignani
1Service d'Astrophysique/CEA, CE-Saclay, 91191 Gif/Yvette, France. fmirabel@cea.fr
Nature
|September 15, 2001
Resumen
Los investigadores estudiaron el agujero negro XTE J1118+480, encontrando que tiene una alta velocidad espacial. Su órbita sugiere que se originó en la galaxia primitiva, no en un reciente disparo de supernova desde el disco galáctico.
Área de la Ciencia:
- La astronomía es la astronomía.
- La astrofísica es la astrofísica.
- Evolución Estelar Evolución Estelar
Sus antecedentes:
- La mayoría de los agujeros negros conocidos de masa estelar residen cerca del plano galáctico.
- Los agujeros negros que se encuentran lejos del plano pueden ser expulsados por patadas de supernova o ser restos antiguos.
- Comprender su movimiento es clave para distinguir los orígenes.
Objetivo del estudio:
- Para determinar el movimiento transversal del agujero negro la nova de rayos X XTE J1118+480.
- Para investigar el origen y las características orbitales de este sistema de agujero negro.
Principales métodos:
- Medición del movimiento transversal de XTE J1118+480 en el plano del cielo.
- Analizando los parámetros orbitales del sistema binario de rayos X.
Principales resultados:
- Se deriva una gran velocidad espacial para XTE J1118+480.
- Observaron una órbita excéntrica alrededor del Centro Galáctico, característica de los objetos de halo.
- Las propiedades del sistema sugieren una edad comparable o superior a la edad del disco galáctico.
Conclusiones:
- Es poco probable que la alta velocidad y la órbita excéntrica del agujero negro sean el resultado de una típica patada de supernova del disco galáctico.
- Los hallazgos apoyan la hipótesis de que XTE J1118+480 es un antiguo remanente de la galaxia primitiva.
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